Investing.com - Walmart (NYSE:WMT). AT&T (NYSE:T). Southwest Airlines. Bank of America (NYSE:BAC).Those are some of the dozens of U.S. companies that have announced plans to improve worker compensation because of the Trump administration's massive tax cut package.More than 100 companies have made changes, affecting 1 million workers, according to the conservative advocacy Americans for Tax Reform, which is keeping a list.Many companies have chosen a one-time bonus. Others have decided to raise hourly wages or improve benefits, such as 401(k) retirement plans. Some have opted for a combination. The most common bonus amount is $1000 dollars.The banking industry has the most companies on the list.The tax cut package slashes corporate taxes from 35% to 21%, a move that will save companies billions of dollars a year.